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while Heiner Marxen already started with a [https://en.wikipedia.org/wiki/Chess_problem#Types_of_problem mate-in-two] solver written in [[Fortran|Fortran II]] in 1973
<ref>[http://www.talkchess.com/forum3/viewtopic.php?f=7&t=41373&start=5 Re: Perft(3) from 1978, with a twist!] by [[Heiner Marxen]], [[CCC]], December 09, 2011</ref>.
Chest does not play chess, but proves shortest solutions or its absence. It was first released in December 1999 as [[:CaregoryCategory:Open Source|open source]]
<ref>[https://www.stmintz.com/ccc/index.php?id=83247 CHEST 3.19 is available] by [[Heiner Marxen]], [[CCC]], December 18, 1999</ref>.
